Release 1.16 - Export to Word and PDF

Thanks to some excellent suggestions from GitHub user borekb, release
1.16 has a mother-load of new features.

Version Checking: When a new version of MDE is published, an icon
will appear in the title bar. I tried to make it subtle enough to
inform without be annoying.

The big red arrow is doesn’t appear in the production version :)

Alternate Line Endings: Apparently, some Mac users are defecting and
using MDE. Scandalous! But I won’t tell.

Export to Word and PDF: Check out the Save As dialog. There are
options to save the to docx and pdf. html was added to
be consistent. Don’t worry, the original shortcuts for exporting to
html still work. (Issue #68, #69)

Support for custom Markdown converters: This one is kind of geeky,
but you can use a different Markdown converter provided it’s a
console application and reads and writes to standard input/output.
This is mostly for those who want to tweak the Pandoc settings
MDE uses. You’ll have to edit the settings file directly. Example:

"CustomMarkdownConverter": "pandoc -f markdown_mmd -t html"

This is also used for preview so it’s best if you stick to
converting to HTML. (Issue #67)

Remove auto image pasting from clipboard: Did you know you could
paste an image to MDE and it would automatically upload it to MDE?
As well intentioned as that was, it represented a privacy issue so I
removed it. (Issue #73).